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Acquisitions - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2013
Entity
Sep. 30, 2013
Jun. 30, 2012
Entity
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Business Acquisition [Line Items]            
Number of business acquisitions completed 2   4      
Cash paid for acquisitions, net of cash acquired $ 123,800,000 $ 123,759,000   $ 124,736,000 $ 68,727,000  
Number of shares issued for acquisition of company 763,272   1,927,113      
Common stock value 18,700,000   37,300,000      
Cash paid for acquisition     57,500,000      
Payment of cash to repay acquiree debt     11,000,000      
Accounts receivables with fair value   38,200,000   38,200,000   15,300,000
Goodwill   1,650,012,000   1,650,012,000   1,537,645,000
Revenues contributed by acquisitions   83,500,000   83,500,000    
Income before income taxes contributed by acquisitions   4,300,000   4,300,000    
Acquisitions [Member]
            
Business Acquisition [Line Items]            
Goodwill expected to be deductible for income tax   75,700,000   75,700,000   52,900,000
Electric Power Division [Member]
            
Business Acquisition [Line Items]            
Goodwill   1,137,207,000   1,137,207,000   1,065,152,000
Electric Power Division [Member] | United States [Member]
            
Business Acquisition [Line Items]            
Number of business acquisitions completed 1   2      
Electric Power Division [Member] | Canada [Member]
            
Business Acquisition [Line Items]            
Number of business acquisitions completed     1      
Electric Power Division [Member] | Acquisitions [Member]
            
Business Acquisition [Line Items]            
Goodwill   76,800,000   76,800,000   57,500,000
Natural Gas and Pipeline Division [Member]
            
Business Acquisition [Line Items]            
Goodwill   178,015,000   178,015,000   137,703,000
Natural Gas and Pipeline Division [Member] | Australia [Member]
            
Business Acquisition [Line Items]            
Number of business acquisitions completed 1          
Natural Gas and Pipeline Division [Member] | United States [Member]
            
Business Acquisition [Line Items]            
Number of business acquisitions completed     1      
Natural Gas and Pipeline Division [Member] | Acquisitions [Member]
            
Business Acquisition [Line Items]            
Goodwill   $ 41,100,000   $ 41,100,000   $ 7,300,000